Semikron SKKT27B16E | Robust Thyristor Module for Phase Control Applications
The Semikron SKKT27B16E is an industry-proven power module engineered for reliability and precision in demanding AC power control applications. As a dual thyristor module (also known as a Silicon Controlled Rectifier or SCR module), it provides a robust and efficient solution for controlling high-power loads directly from AC mains. Housed in the industry-standard SEMIPACK® 1 package, this device is built for longevity and straightforward integration into industrial systems.
- High Blocking Voltage: With a 1600V rating, it offers a significant safety margin for applications on 380V and 480V AC lines.
- Proven Reliability: Features glass passivated thyristor chips, ensuring stable performance and long-term blocking voltage capability even in harsh environments.
- Industry-Standard Package: The SEMIPACK® 1 package with an isolated baseplate simplifies thermal design and ensures secure, reliable mounting.
- Optimized for Line Frequency: Designed specifically for high-efficiency operation in 50/60 Hz phase control circuits.
Key Technical Specifications
The following table outlines the critical performance parameters for the SKKT27B16E, providing engineers with the essential data for system design and simulation. For a comprehensive list of all parameters, you can download the official SKKT27B16E datasheet.
| Parameter | Value |
|---|---|
| Repetitive Peak Off-State Voltage (VDRM, VRRM) | 1600 V |
| Average On-State Current (ITAV) | 28 A (Tcase = 85°C) |
| RMS On-State Current (ITRMS) | 60 A |
| Surge Current (ITSM) | 550 A (10 ms, 50 Hz) |
| Threshold Voltage (VT(TO)) | 0.85 V |
| On-state Slope Resistance (rT) | 19 mΩ |
| Operating Junction Temperature (Tj) | -40 to 125 °C |
| Package Type | SEMIPACK® 1 |
Application Scenarios & Engineering Value
The SKKT27B16E is not a general-purpose switch; it is a specialist component that excels where precise, reliable AC power regulation is paramount. Its design provides tangible benefits in several key industrial applications.
- AC Motor Soft Starters: By precisely controlling the firing angle of the thyristors, the SKKT27B16E gradually ramps up the voltage supplied to AC induction motors. This eliminates high inrush currents and reduces mechanical shock on gearboxes and couplings, extending the life of the entire drive train.
- Industrial Temperature Control: In large-scale heating systems, this module provides highly reliable, proportional control of power to resistive heating elements. Unlike mechanical contactors, it offers silent, arc-free switching and a virtually unlimited operational life.
- Controlled Rectifiers: For battery chargers and DC power supplies, the SKKT27B16E can be configured as a controlled bridge rectifier. This allows for the creation of a variable DC output voltage from a fixed AC input, providing a robust front-end for power conversion systems.
Technical Deep Dive: The Foundation of Reliability
Two core technological choices by Semikron underpin the performance and durability of the SKKT27B16E.
First, the use of glass passivated thyristor chips is critical. This manufacturing process involves depositing a layer of specialized glass over the semiconductor junction. This creates a hermetic, stable seal that protects the high-voltage region from moisture and contaminants. The direct result for a design engineer is predictable, long-term stability of the 1600V blocking capability, which is essential for system safety and reliability.
Second, the SEMIPACK® 1 package is engineered for industrial reality. Its isolated baseplate, typically using a Direct Copper Bonded (DCB) substrate, provides excellent electrical isolation while ensuring a low thermal resistance path to the heatsink. This focus on effective thermal management allows the module to handle its rated current reliably. The robust screw terminals ensure that connections remain secure despite mechanical vibration.
Frequently Asked Questions (FAQ)
Q: What is the main difference between this thyristor module and an IGBT module?
A: The fundamental difference lies in their switching behavior and intended application. The SKKT27B16E is a thyristor-based module, a latching device ideal for low-frequency (50/60 Hz) AC power control and rectification. It turns on with a gate pulse and turns off naturally when the current through it falls to zero. In contrast, IGBT modules are high-frequency, non-latching transistors designed for DC-AC inverters and switch-mode power supplies, where they can be turned on and off actively at thousands of times per second.
Q: Is the SKKT27B16E suitable for a variable frequency drive (VFD)?
A: No. A VFD requires high-frequency switches like IGBTs to synthesize a variable frequency AC waveform. Thyristors, due to their slow turn-off characteristics, cannot operate at the frequencies required for motor control PWM and are therefore not used in the inverter stage of a VFD. Their role is typically in the front-end converter or soft starter.
For complex applications or to discuss alternatives, please contact our technical team for expert guidance.
